<template>
    <el-container class="home-container">
        <el-header>
            <div>
                <img src="../assets/heima.png" alt="">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <el-container>
            <el-aside :width="isCollapse ? '64px' : '200px'">
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <el-menu background-color="#313743" text-color="#fff"
                    active-text-color="#3a97f2" unique-opened router 
                    :collapse="isCollapse" :collapse-transition="false"
                    :default-active="activePath">
                    <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
                        <template slot="title">
                        <i :class="iconObj[item.id]"></i>
                        <span>{{item.authName}}</span>
                        </template>
                        
                        <el-menu-item :index="'/'+subItem.path" 
                        v-for="subItem in item.children" 
                        :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                            <template slot="title">
                            <i class="el-icon-menu"></i>
                            <span>{{subItem.authName}}</span>
                            </template>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <el-main>
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>
<script>
export default {
    data() {
        return{
            isCollapse:false,
            menuList:[],
            iconObj:{
                '125':'iconfont icon-user',
                '103':'iconfont icon-tijikongjian',
                '101':'iconfont icon-shangpin',
                '102':'iconfont icon-danju',
                '145':'iconfont icon-baobiao'
            },
            activePath:'/user',
        }
    },
    created() {
        this.getMenuList();
        this.activePath = window.sessionStorage.getItem("activeNavPath");
    },
    methods:{ 
        logout(){
            window.sessionStorage.clear();
            this.$router.push('/login');
        },
        toggleCollapse(){
            this.isCollapse = !this.isCollapse;
        },
        async getMenuList(){
            const { data: res } = await this.$http.get('/menus')
            if( res.meta.status !== 200 )   return this.$message.error(res.meta.msg)
            this.menuList = res.data
        },
        saveNavState(activeNavPath) {
            window.sessionStorage.setItem('activeNavPath',activeNavPath);
            this.activePath = activeNavPath
        }
    }
}
</script>
<style lang="less" scoped>
    .el-header{
        display: flex;
        justify-content: space-between;
        background-color: #373d41;
        align-items: center;
        padding-left: 0;
        color:#fff;
        font-size: 20px;
        > div {
            display: flex;
            align-items: center;
            span{
                margin-left: 15px;
            }
        }
    }
    .el-aside{
        background-color: #333744;
        .toggle-button{
            background-color: #4a5064;
            font-size: 10px;
            color: #fff;
            cursor: pointer;
            text-align: center;
            letter-spacing: 0.2em;
            line-height: 24px;
        }
        .el-menu{
            border-right: 0;
        }
    }
    .el-main{
        background-color: #eaedf1;
    }
    .home-container{
        height: 100%;
    }
    .iconfont{
        margin-right: 10px;
    }
</style>